Physics Spl

According to the kinetic theory of gases class 11, the Maxwell-Boltzmann distribution law describes the gas molecules' distribution of speeds (or velocities). All molecules of gas do not move at the same speed, some move fast, some are slow and most move at an average speed. This law provides a mathematical function that helps in finding at a given temperature, how many molecules have a particular speed. The Maxwell-Boltzmann distribution law helps in defining three important types of speeds:

• Average speed: Arithmetic mean of all speeds.
• Most probable speed: Speed at which the maximum number of molecules travel.
• Root mean square (RMS) speed: Square root of the average of squares of all speeds. 

The kinetic theory talks about the molecular explanation for the classical gas laws:

Boyle's Law (P? 1/V at constant T): Gas molecules will exert more pressure when the volume of the container reduces as it has less space to move and hence it collides with the walls of the container. However, when the temperature is constant, the speed of the molecule will not change.

Charles's Law (V? T at constant P): With the increase in temperature, the speed and average kinetic energy of the molecules increase. The gas expands to maintain constant pressure and increases the volume.

The kinetic theory links the physical behaviour of gases with the molecular motion and supports the ideal gas equation.

The official answer key for KCET 2025 Physics (Paper A1) is expected to be released by the Karnataka Examination Authority (KEA) around April 30, 2025. Candidates can download the answer key from the official KEA website at cetonline.karnataka.gov.in. To access the answer key, visit the website, navigate to the 'Answer Key' section, and select the appropriate subject and version code. This will allow you to download the Physics answer key in PDF format?

Please note that the provisional answer key will be released first, followed by the final answer key after considering any objections raised by candidates. The final answer key is typically published in June 2025.

The kinetic theory is based on many key assumptions, such as the following:

• The individual gas molecules volume is almost non-existing when compared to the total volume of the gas.
• A gas consists of many small, identical, hard spherical particles.
• The collisions between the gas particles and the container walls are perfectly elastic.
• Except during the collisions, there are no intermolecular forces between the atoms.
• The time spent in collisions is almost nil when compared to the time between collisions.
• The gas molecules are in random and constant motion.
• The average kinetic energy of the molecules is directly proportional to the absolute temperature.